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UNITED STATES PATENT OEEICE.

VILHELM ARNEMANN, OF HAMBURG, GERMANY.

SMOKE-CONSUMING FURNACE.

SPECIFICATION' forming part of Letters Patent No. 491,233, dated February 7, 1893. Application tiled November 28, 1892. Serial No. 453,327. (No model.)

To all whom it may concern:

Be it known that I, WILHELM AENEMANN, a citizen of the United States, residing in the city of Hamburg, Germany, have invented certain new and usefullmprovenientsin Smoke Consuming Furnaces, of which the following is a specification.

This invention relates to certain improvements in smoke consuming furnaces of that class in which highly heated air is supplied to and mingled with the products of combustion at or near the fire-bridge so that a more perfeet combustion of the unburned carbon-particles contained in the tire gases is obtained; and the invention consists of a furnace, the fire-bridge of which is formed of several passages or channels which are arranged sidewise of and one back ot the other, the discharge-orifices of said channels bei-ng inclined in a direction opposite to the course of the products of combustion so as to mingle with the same in front of and above the tire-bridge. The lower ends of the passages or channels are closed by acolleeting box or casing, which is connected by one or more longitudinal pipes or fines, that are located below the grate-bars of the furnace, said pipes or ues being provided at theirfront-ends with dependent hoods or deectors that extend from the upper parts of said pipes to some distance below said pipes and with valves by which the ingress of air into the supply-pipes is regulated.

In the accompanying drawings, Figure 1 represents a vertical longitudinal section of a smoke-consuming furnace with my improved lire bridge, shown as arranged in the firespace of a Cornwall-boiler. Fig. 2 is a planview of the same, partly in horizontal section, line 2 2, Fig. 1.

Similar letters of reference indicate corresponding parts.

Referring to the drawings A represents a steam-boiler of the so-called Cornwall type, or of any other suitable construction, B a furnace which is arranged either in the tire-space of the same or below the boiler as desired, C the grate-bars and D the tire-bridge, which is arranged with two or more air passages or channels, that are constructed of a number of cast iron plates D D2 D8 as shown clearly in Fig. 1. The upper ends of the air passages or channels d are provided with discharge orifices d that emit the air supplied to the same in a direction opposite tothe direction ot the products of combustion, so as to producea 5 5 perfect and-successive intermingling of thehot air with said products of combustion. The plates D' D2 D3, by which the air passages or channels d are formed, are supported in suitable manner at the rear end of the furnace, 6o

the front plate D being supported on the rear-bar D4 of the grate, while the rear plate D8 is supported on a shoulder of an upright breast plate D5 which is backed by alayer of tire-bricks. The intermediate plate D2 is attached at the ends to the front and rear plates D D3 and supported by the same. The lower ends of the front and rear plates D and D3 are connected bya casing E, which is preferably made of a V-shaped cross-section and 7o which is formed of two convergingwrought iron plates,that are closed at their lower ends, said plates forming a collecting box for the air supplied from the front-endet the furnace to the lire-bridge D. One or more longitudi- 75 nal air-pipes or lues F are connected with the lower part of the collecting box or casing E, said pipes are extended in longitudinal di` rection below the grate-bars to the front-end of the furnace where they are provided with 8o curved hoods ordetlectors F that are attached to the upper parts of said conducting pipes or dues, their lower parts being extended parallel thereto in backward direction, as shown clearly in Fig. 1. Hinged valves F2 that are 85 operated by suitable rods f from the outside of the furnace are applied to the ingoing ends of the air-supply pipes F so as to regulate the quantity ot air that is conducted through the same to the fire-bridge. tlectors F take up the air from the space below-the grate, where the air is already heated up to some extent by the heat radiated by the fire on thegrate-bars and conduct the same to the ingoing ends of the air-supply pipes The hoods or de- 9o and through the same into thenMpg--boze """fr or casing E from wh 'e air which is h aired:

up to a h 0' n the pipes or dues F is conducted to the passages or channels and emitted through the` roo orifices ofthe s ame so as to mingle with the products of combustion, before and`during their passage over the {ire-bridge. The air drawn in at the ingoing ends of the pipes or lues F is subjected throughout its eol through the air-pipes and collecting-box to theheat lradiated by the fire and grate-bars, `s0 that the same is gradually heated to ahigh temperature, until it is mingled with the pro'- ducts of combustion, which are therebybu rned in amore perfect mannerabove the fire-bridge, and the result being a superior combustion of the .products 'of combustion and the unconsu m ed carbon-particles'eontained in the sam e, so that the formation of smoke is to a great extent prevented and a higher degree of heat y -obtained with a considerable saving of fuel.

Having thus described my invention,` I claim as new and desire to secure by Letters Patent:

1. In a smoke consuming furnace, the com- Y bination of hollow fire bridge composed of outer plates'nd'isupportedrespeetively on the rear bar D4r of the grateand an upright breast plate D5, and an inner plate D2 connected to said outer plates at the ends, a eolvalves arranged at the front-end of said pipes,

leeting box connecting the lower ends of the outer plates, and conducting pipes extending from the collecting box below the grate bars toward the front of the furnace.

2. In a smoke-consuming furnace, the combination, of a .hollow fire-bridge, composed of a number of platefornng passages or channels, awww said channels, con4 ting pipes extending from the collecting-box" orl casing below the grate-bars toward the front of the furnace, defieetors or hoods attached. to the ingoing ends of said pipes and regulating valve or substantially as set forth.

In testimony that I claim thelforegoing as my invention I have signed my name in presence of two subscribing Witnesses;

XVM. ARNEMANN.

Witnesses:

PAUL GOEPEL, CHARLES SCHROEDER. 

